Confirming here on Kubuntu Intrepid 8.10 rc, nvidia 177.80 drivers. With 
"Backingstore" option set to on KDE4 crashes *a lot* - mostly using Konsole. If 
Konsole gets remembered in session, this leads to KDE4 crashing immediately 
after login.
@Chris: I think this bug may affect more people than expected; examples:
- http://www.nvnews.net/vbulletin/showthread.php?t=120630
- http://my.stargazer.at/2008/10/13/kde-4-no-thanks-yet/
- http://www.nvnews.net/vbulletin/showthread.php?t=115535
- http://bugs.kde.org/show_bug.cgi?id=169147
Moreover, one can easily find instructions to improve performance in KDE4 for 
nVidia cards like this: http://userbase.kde.org/GPU-Performance and setting 
backingstore to "on" is mentioned all the time. It really took me a while to 
find this bug report and an advice: 
http://forum.kde.org/showthread.php?tid=6721&pid=7344#pid7344.

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Xorg crashed with SIGSEGV in miValidateTree
https://bugs.launchpad.net/bugs/274988
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